I can tell you 2 things to help you:
- Yes the big ISP will fitter-out anything below an /24 (believe me I'm
working for an big one)
- And, no all the traffic will not come by the new ISP, because you are
going to announce your block under your own AS (I did told you that you will
need an AS number?). And I'll have the same size of announce through both
ISP.
Good luck.
Alain
>From: John Neiberger <[EMAIL PROTECTED]>
>Reply-To: John Neiberger <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: BGP, Multihoming, and Me
>Date: Fri, 13 Oct 2000 07:35:35 -0700 (PDT)
>
>I have a question that I'm sure has been referenced before but I couldn't
>find an answer in the archives, and it's more practical than technical.
>
>We have a single T-1 connection to an ISP for customer access to our
>internal webservers so that our banking customers can do web-based
>transactions and get account information. This is such an important aspect
>of our business that we decided to get a second T-1 to another ISP for
>redundancy. We aren't as concerned with being able to load-balance, which
>is a dicey prospect in this arrangement anyway.
>
>Now, the problem: we have a tiny subnet assigned to us from ISP-1, it's a
>/27. Now let's say we get a connection to ISP-2 and we start running BGP.
>Is ISP-2 probably going to have a problem letting us advertise such a small
>set of routes? I've been hearing that big ISPs tend not to want to
>advertise subnets smaller than a /18. If that's the case, our plan is in
>trouble.
>
>Now, problem #2: even if we can advertise a /27 through ISP-2, ISP-1 is
>going to have to agree to advertise our /27 along with their aggregate
>advertisement. If they don't, and they only advertise their aggregate,
>this
>will cause return traffic to our network to come through ISP-2 because it
>will be advertising a more specific route, correct? If that's correct, do
>ISPs tend to have a problem with this arrangement?
>
>Basically, are we setting ourselves up for disappointment? Are there any
>other factors that I should be aware of that I'm not considering? Should I
>become a yak herder and move to Nepal?
>
>Thanks, as usual...
>John Neiberger
>
>
>
>
>
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